domain name system - What am I doing wrong with bind9?

I am trying to bind a domain name to a vps but I am failing..

I get this when I dig:

; <<>> DiG 9.10.3-P4-Ubuntu <<>> ns1.example.com @61.15.2.95
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49520
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2
;; WARNING: recursion requested but not available


;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;ns1.example.com.           IN  A

;; ANSWER SECTION:
ns1.example.com.        604800  IN  A   61.15.2.95

;; AUTHORITY SECTION:

example.com.        604800  IN  NS  ns2.example.com.
example.com.        604800  IN  NS  ns1.example.com.

;; ADDITIONAL SECTION:
ns2.example.com.        604800  IN  A   178.159.2.95

;; Query time: 314 msec
;; SERVER: 178.159.2.95#53(178.159.2.95)
;; WHEN: Sat Apr 15 14:26:22 +04 2017
;; MSG SIZE  rcvd: 106

Problem
;; WARNING: recursion requested but not available
since it is just a warning I tried to register it at quickhostuk but I got this error at dns management:

Failed to Modify Domain Nameservers: Nameserver not found at registry

here is what I did..

say, my vps IP is: 61.15.2.95
domain name: example.com
name servers:

• ns1.example.com=>61.15.2.95


• ns2.example.com =>61.15.2.95

1.I installed bind9.

2.I created a zone in named.conf.local

zone "example.com" {
        type master;
        file "/etc/bind/db.example.com";
};

3. I created a db file for db.example.com

;
; BIND data file for local loopback interface
;
$TTL    604800
@       IN      SOA     ns1.example.com. root.ns1.example.com. (
                              3         ; Serial
                         604800         ; Refresh
                          86400         ; Retry
                        2419200         ; Expire
                        604800 )       ; Negative Cache TTL

;
@                IN      NS      ns1.example.com.
@                IN      NS      ns2.example.com.
@                IN      A       61.15.2.95
ns1              IN      A       61.15.2.95
ns2              IN      A       61.15.2.95

4.I modified named.conf.options and I added my vps ip to forwarders, I also tried google's 8.8.8.8 and 8.8.4.4

options {
        directory "/var/cache/bind";

        // If there is a firewall between you and nameservers you want
        // to talk to, you may need to fix the firewall to allow multiple
        // ports to talk.  See http://www.kb.cert.org/vuls/id/800113

        // If your ISP provided one or more IP addresses for stable
        // nameservers, you probably want to use them as forwarders.
        // Uncomment the following block, and insert the addresses replacing

        // the all-0's placeholder.

        forwarders {
                61.15.2.95;
        };


        //========================================================================
        // If BIND logs error messages about the root key being expired,
        // you will need to update your keys.  See https://www.isc.org/bind-keys

        //========================================================================
        dnssec-validation auto;

        auth-nxdomain no;    # conform to RFC1035
        listen-on-v6 { any; };
};

How should I correctly put it all together to make it work?